package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
@Slf4j
@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1. 获取请求路径
        String url = request.getRequestURI();
        //2. 判断路径是否是登录
        if (url.contains("/login")) {
            log.info("登录请求:{},放行", url);
            filterChain.doFilter(request, response);
            return;
        }
        //3. 获取token
        String jwt = request.getHeader("token");
        //4. 判断token是否为空
        if (jwt == null|| jwt.isEmpty()) {
            log.info("请求头不存在" );
            response.setStatus(401);
            return;
        }
        //5. 解析token
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("用户id,存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        }catch (Exception e){
            log.info("令牌解析失败");
            response.setStatus(401);
            return;
        }
        // 6. 放行
        log.info("放行");
        filterChain.doFilter(request, response);

        log.info("删除ThreadLocal中的登录用户信息");
        CurrentUserHoler.removeCurrentUser();
    }
}

